Pneumatic tool.



PATENTED JUNE 2, 1903. D.'G. FOLEY. PNEUMATIC TOIOL. APPLICATION FILED AUG. 29, 1902.

, Hartford, in the county of Hartford and State anvil to resist the blow of the hammer or impact of a blow and at the same time odor required work. From the very nature of the UNITED STATES? Patented June 2, 1903.

"PATENT OFFI E.

P Nl-IUMA'TIC T'ooL."

SPECIFICATION forming part of Letters Patent No. 730,207, dated June 2, 903;

Application filed August 29, 1902.

To all whoritiitmay concern..-

Beitknown that I, DENNIS G. FOLEY, a citizen of the United States, and a resident ofof Connecticut, have invented a certain new and useful Improvement in Pneumatic Tools, of which the following is a specification.

The invention relates to pneumatic tools, and more particularly to a tool'of this general class adapted to receive and absorb the suflicient resistance to the blow to efiect the tool and the purpose for which it is designed it might very properly be called a pneumatic anvil.

The object of the invention is to provide a tool which may be used for various purposes andin various positions, to provide a backing to suitably resist a blow or other mechanical strain incidental to riveting or swaging, or, in fact, for any purpose in the arts.

A further object of the invention is to provide a tool which may be used in more or less inaccessible positions or places and which will have such features offladjustment as to accommodate itself to various conditions of use.

A particular object of the invention is to provide what might be'called a pneumatic swaging-tool ordinarily employed in the riveting incident to boiler structures or the like.

Referring to the drawings, Figure 1 is a diagrammatic view illustrating the method of using the improved tool. Fig. 2 is a View in side elevation of the device, Fig. 3 is afront view of the improved tool. Fig. 4 is a detail sectional view through the device.

In the accompanying drawings, the numeral 1 denotes the outer plate or shell of a locomotive-boiler, and 2 the inner plate or shell, a water-space being formed between these two plates, this water-space 3 being located adjacent to the fire-box 4.. Over the firebox and within the inner shell are the header-plates 5, into-which the fire-tubes 6 are expanded. The water-space 3is closed at or near its bottom by a mud-ring 7, while a dome-plate 8 is arranged over the tubes 6, an independent plate or shell 9 joining the 'ets11..

plates 8 and 2. Stay-bolts 10 are secured to Serial No. 121,489. (No model.)

the ihner and outer-shells 2 an d;1 ,i a1id in' manycases these stay-bolts are located below the meeting or overlapping edgesot the plates 9- and 2,1hjlS joint beingformed in many instances in renewing the lo we rportion of the inner plate or shell as'a wh'olewhen itlower portion of the inner plate or shell the water-space 3 affords a very inaccessible space within which to work or even to place a suitable stop or backing'to receive the im-' pact of the blowsnecessary to upset the riv- So far as known, in renewing the lower part of the inner shell it has been the practice to insert a wedge or block between the inner and outer shells; but this has many disadvantages from the fact that itis difficult to position the wedge or block without removing the mud-ring, which-is undesirable, and eventhen it is often impossible to position the block or wedge in view of the interference of the'stay-bolts', and, further, it, is impossii,

bleto locate the seam at the desired height "3 from the bottoni of the fire-box, for'th'ere'a son that the wedge or block cannot be inserted in thawater-spacejS to the requiredfextentand a'fmther v ge results inv usinga solid block, which having-no resili-l encytransmits the entire shock of theblowjtot s Theimproved tool herein described obvithe outer shell to thedetrim'entof the latter.

ates all of these'objectionsand'has other ad- 'vantageous features. Briefly,jit consistsof 9 an outer or base ring 12, interiorly threaded to receive a casing 13, which provides a pres sure-chamber 14, within which is. located a I piston'or anvil 15. This anvil or piston is suitably packed adjacent to the inner wall of the pressure-chamber by a packing-ring 16,

which is located in a flange 17, the latter forming an abutment for one end of aspring 18, which normally holds the anvil or piston within the pressure-chamber.

A ring 19 is located within the casing 13 and holds the spring 18 in position. v The outer surface of the anvil or piston is preferably slightly concaved in order to center the tool with reference to the rivet to be backed up f and held.

It will be noted that the casing 13 and outer or base ring are adjustable, so that the tool may be varied as to thickness, and the outer shell is provided with openings 20, through which a supply-pipe may be inserted and screwed into a socket in the casing 13. This provides a very convenient and delicate though positive adjustment for the parts, the openings 20 being preferably arranged in staggered relation to each other, so that the socket in the casing 13 will register with one of said openings as the casing is moved in or out of the basering. By turning the two parts one with reference to the other until one or the other of the openings 20 registers with the socket in the wall of the pressurechamber and then inserting the supply-pipe the parts will be locked in any desired position of adjustment.

The supply-pipe 21 serves also as a handle for placing the tool in position. This pipe is connected with a suitable compressor 22, arranged to give the desired pressure for forcing the anvil 15 outward and against the back of the rivet. For convenience a three-way valve or cook 23 is located in the pressure connections, and by manipulating this air or other fluid under pressure may be admitted to or released from the pressure-chamber 14:.

In using this tool it is not necessary to remove the mud-ring 7, as the tool when in normal condition is comparatively thin and may be inserted and positioned by simply springing out the lower edge of the plates or casing of the fire-box, as illustrated at 24. After insertion the tool is positioned and the compressed fiuid admitted to the pressure-chamber, whereupon the anvil or piston is forced outward until it contacts and presses against the rivet or part to be swaged. The outer or base ring of course bears. upon the inner wall of the outer shell, having been made of the approximate thickness to accommodate itself to the space between the two plates before having been inserted. However, owing to the air-cushion between the anvil and base-ring a comparatively small or slight shock is transmitted to said outer shell.

\Vhile the improved tool has been described herein in detail, it is obvious that many changes may be made in the details of construction and the general organization of the parts without departing from the spirit of the invention,which contemplates provid' ing a resilient or cushioned anvil and, further, one that may be expanded to different degrees.

What I claim as my invention, and desire to secure by Letters Patent, is

1. In combination, a comparatively short base or support having the greater part of its interior surface threaded, a comparatively short casing having the greater portion of its outer surface threaded to fit the thread in the base and having a pressure-cl1an1ber, an anvil projecting within the pressure-chamber and a fluid connection for admitting a pressure medium. within said chamber.

2. In combination, a base or support, a casing adjustably mounted in the base and having a pressure-chamber, an anvil projecting within the pressure-chamber, a rigid connection for admitting fluid extendingv from the chamber through the wall of the base and projecting beyond the latter.

3. In combination, a base or support having an opening for the entrance of a fluid connection, a. casing supported on the base and having a pressure-chamber and an opening to receive the fluid connection, an anvil located within the pressure-chamber, and a fluid connection with the casing.

4. In combination, a base or support having openings staggered with reference to each other, a casing adjustably supported on the base and having an opening adapted to register with the openings in the base, and an anvil projecting into the casing.

5. In combination, a base or support, a casing adjustably supported on the base and having a pressure-chamber, an anvil projecting into the pressure-chamber, a resilient connection between the anvil and casing, and a fluid connection with the pressure-chamber through the base or support.

DENNIS G. FOLEY.

Witnesses:

ARTHUR B. JENKINS, CLARA MORRIS. 

